I don't know much about these subs, but I'll give my $0.02 though
In engineering we learn that corners are the weakest point in many structures. Corners get the most stress, which is why rounds are added to corners... in this case, the smaller the radius in the corner, the weaker it is and the larger it is, the stronger it'll be. The bottom line is that if you run this for a very long time (given that it doesn't blow first) then the corners will be first to fail.